Method for forming surface decorated particles
First Claim
1. A method for forming surface decorated electrophotographic toner particles comprising:
- stabilizing dispersed hydrophobic phase core particles having an outer surface in an aqueous phase with fine inorganic particles having active hydroxyl sites on their surfaces with a first portion and second portion where the first portion is hydrogen bonded to the outer surface of the hydrophobic phase core particles andtreating the stabilized dispersed hydrophobic phase core particles with a reactant containing hydrophobic groups to covalently bond hydrophobic groups to the second portion of the surfaces of the fine inorganic particles positioned away from the outer surface of the hydrophobic phase core particles while maintaining the hydrogen bonding of the first portion to the fine inorganic particles.
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Abstract
A method for forming surface decorated particles including stabilizing dispersed hydrophobic phase particles in an aqueous phase with fine inorganic particles having a relatively hydrophilic surface; and treating the stabilized dispersed hydrophobic phase particles with a hydrophobic group containing reactant to form hydrophobic groups covalently bonded to surfaces of the fine inorganic particles. In a particular embodiment, the invention provides a limited coalescence process for preparing binder polymer particles using inorganic stabilizer particles that provide a plurality of surface bonding sites and reacting such sites with a plurality of alkoxy silane moieties that contains pendant hydrophobic groups.
17 Citations
19 Claims
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1. A method for forming surface decorated electrophotographic toner particles comprising:
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stabilizing dispersed hydrophobic phase core particles having an outer surface in an aqueous phase with fine inorganic particles having active hydroxyl sites on their surfaces with a first portion and second portion where the first portion is hydrogen bonded to the outer surface of the hydrophobic phase core particles and treating the stabilized dispersed hydrophobic phase core particles with a reactant containing hydrophobic groups to covalently bond hydrophobic groups to the second portion of the surfaces of the fine inorganic particles positioned away from the outer surface of the hydrophobic phase core particles while maintaining the hydrogen bonding of the first portion to the fine inorganic particles. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification